I am struggling to get SEO clients from the internet

What are the services you are offering? if they were any good, you wouldn't have difficulty finding clients on those channels (though i suspect they are NOT good because you are offering your services on Fiverr)

My advice, have the brilliant content writer [sic] proofread your forum advertisements.

Build your friend network and keep creating helpful, free content on your blog, showing off your SEO skills. Business flows to generous, skilled folks in any niche. Especially SEO. Also note you want to be clear and highly skilled in this niche to stand out from folks who send pitches via email. I get many such pitches and junk instantly because they reach out unsolicited. So to stand out, make friends with established pro bloggers by commenting on their blog and by promoting them and by helping them out. Pay your dues, invest in your online tuition, and eventually, as your friend network and trust factor grows, you will grow your client base.

Well I am going to give you some advice and some people might not like it but those of us in SEO will know its pretty good advice

I am an African American and I'll tell you right now if I lived in Nigeria - I wouldn't advertise it because of the reputation for fraud. The goal of business is to make money not argue with people about "not all Nigerians are scammers"

If I wanted to make it in the English market I'd get a business name that didn't sound Nigerian too. I'd have pride in Nigeria somewhere else. My business is about making money. I limit my income by having to battle the reputation of fraud.

You want good english based paying clients? You are in an English speaking forum after all. Get someone that speaks great English . Get an English sounding international name because honestly - Indian SEO has a poor reputation among businesses that know SEO.

I am not saying if its fair or not. Its just the way things are. If you can rank sites and can call businesses with an English speaker that sound like a native english speaker then you should be able to close some of the calls especially if you can show some results before pay (not ranking just movement.

Those should pay you if you know what you are doing $500-$3000 a month US. And for the love of money stop from this day forth mentioning fiverr.

It is highly probable that the clients who pay good money for content already have a stable of good writers they found years or so ago, and have kept them because they continued providing excellent services. Which is why if you are new at this, it'd be hard to penetrate the market. Don't look for bulk, look for quality clients who can pay what you deserve.

Getting SEO clients from internet isn't as you thought. Its difficult and time consuming specially on the platforms you mentioned. Freelancing isn't easy as everyone thought. Fiver and Upwork is a good source to start but its getting tough day by day cause lots of individuals and companies offering same service or quality work in low rates and they have good number of reviews there to catch the client intention towards them.

You need to improve your website SEO and try to rank your website on some keywords that can help you to get organic leads from google. Moreover, increase your circle and join more social networks and introduce your service there and show your previous proven work in SEO.